Digital Cordless Systems Research Articles

A broadband internal planar monopole antenna for mobile phone

AbstractIn this paper, we design and fabricate a broadband interior‐type planar monopole with an omnidirectional radiation pattern over a wide operation band using a slanted feeding shape. It has a measured 10‐dB impedance bandwidth of about 670 MHz (1585–2255 MHz) covering the DCS (digital cordless system, 1710–1880 MHz), PCS (personal communication system, 1850–1990 MHz), and UMTS (universal mobile telecommunication system, 1920–2170 MHz) bands. The slanted feeding shape can obtain the compensation of the input reactance and reduce the antenna height. This planar monopole antenna has a height of only 15 mm and can provide more space for the system ground plane in mobile handsets. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 768–769, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21469

A broadband interior antenna of planar monopole type in handsets

A novel internal antenna of planar monopole type is presented for broadband applications. The proposed antenna fed by a 50-/spl Omega/ microstrip line covers the digital cordless system (DCS, 1710-1880 MHz), personal communication system (PCS, 1750-1870 MHz), and international mobile telecommunication (IMT-2000, 1885-2200 MHz) bands within S/sub 11/<-10 dB. The antenna occupies a compact volume of 20/spl times/17/spl times/4.7 mm/sup 3/ and it is suitable to be built-in within the housing of a mobile phone. The bandwidth of the proposed antenna (VSWR<2) has 740 MHz starting from 1620 to 2360 MHz. The IE3D software and microwave studio (MWS) simulation are employed for optimizing the design parameters, and the simulation results are in agreement with those of the measured one, considering each associated case of the antenna itself, phone case, and battery.

Overview of wireless personal communications

This article presents an overview of the current state of wireless communications, including relevant ongoing activities in technology development, standards, and spectrum allocation. The authors discuss cellular radio, cordless telephony, and wireless data systems. Ongoing and planned future developments are summarized. The presentation is oriented toward broad coverage rather than technical depth. However, brief discussions of the air interfaces for existing digital cellular and digital cordless systems are provided, because the air interface bears heavily on system capacity and the environments in which the system can be used, as well as on the cost and complexity of the equipment.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A simulation study of speech traffic capacity in digital cordless telecommunications systems

A computer simulation tool for evaluating the speech traffic handling capability of digital cordless telecommunications systems has been developed. The focus of the paper lies on the teletraffic engineering problems posed by time division multiple access (TDMA) systems operating with time division duplex (TDD) on one radio transceiver in radio environments. The impacts of fixed station separation, fixed station capacity, spatial traffic variability, dynamic channel assignment, microdiversity, and propagation model on the system capacity are investigated. The simulator serves as an invaluable tool for conducting sensitivity studies and its outputs provide useful insights on traffic performance of digital cordless systems.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>